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Page Title:
CHAPTER 2. MAINTENANCE INSTRUCTIONS |
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 TM 9-2990-206-34&P
CHAPTER 2
MAINTENANCE INSTRUCTIONS
Section 1. TROUBLESHOOTING
(5) A lot of oil in the turbine
2-1. GENERAL.
housing exhaust inlets, with heavy oily
a. Purpose. These troubleshooting
soot deposits on the turbine wheel.
instructions are to be used after the
(6) Heavy oily soot deposits on
turbosupercharger has been removed from
the turbine wheel, with no oil in the
the engine.
turbine housing exhaust inlets.
(7) Damaged or eroded (worn)
(1) These instructions will be
used to make sure the reasons given on
compressor wheel blades.
the repair tag are correct, and to find
out if there are other problems with the
NOTE
turbosupercharger.
If the compressor wheel blades
(2) If no repair tag is attached,
the instructions can be used to find out
are worn, look for dust or sand
deposits in the compressor hous-
what is wrong so it can be repaired.
ing inlet and outlet openings.
b. Inspection. Inspect the turbo-
(8) Peened or feathered edges
supercharger for the problems listed
on compressor wheel or turbine wheel
below, and then go to the Trouble-
blade tips.
shooting Table to find out the cause
and what corrective action to take.
(9) Compressor wheel or turbine
wheel does not turn freely when spun
2-2. INSPECTION.
by hand.
(10) Compressor wheel or turbine
a. Inspect the Turbosupercharger for:
wheel appears very loose when moved in
(1] Broken, damaged, or missing studs. and out or up and down by hand, ac-
(2) Cracked or broken mounting legs
companied by excessive noise.
or oil drain tube.
NOTE
NOTE
If this apparent loose
Mark any damage found for repair
condition is found, press the
turbine wheel and compressor
and continue to inspect for the
wheels in opposite directions, up
following items (3) through (10).
and down as far as possible, with
If no additional problems are
the fingers. Rock them back and
found, the turbosupercharger should
forth and listen for a rubbing
then be cleaned, damaged items
sound. Also press the compressor
replaced, and the unit returned to
wheel and turbine wheel in as
the supply system.
far as possible, rock back and
(3) Cracked or damaged compressor
forth, and listen for a rubbing
housing, turbine housing, or center
sound.
housing.
(4) A lot of oil in the compressor
b. Corrective Action. Refer to table
housing air outlet.
NOTE
A trace of oil in this area is
normal.
2-1
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